Lok Adalat

Today I have got a call from lok Adalat claiming that they have got a case file for non payment of bill of 2100. Which they say can go up to 12000. Means how firstly I have to verify their claims. I have not got any kind of notice from any side. How can they prosecute me . The lawyer who talked with me over phone spoked very rudely . Don't know what to do . Please reply. Easily can they prosecute anyone without any defence from my side please help really